| /******************************************************************************* |
| * Copyright (c) 2006 The Pampered Chef, Inc. and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * The Pampered Chef, Inc. - initial API and implementation |
| * Brad Reynolds - bug 116920 |
| ******************************************************************************/ |
| |
| package org.eclipse.jface.examples.databinding.snippets; |
| |
| import java.beans.PropertyChangeEvent; |
| import java.beans.PropertyChangeListener; |
| import java.beans.PropertyChangeSupport; |
| |
| import org.eclipse.swt.SWT; |
| import org.eclipse.swt.events.ModifyEvent; |
| import org.eclipse.swt.events.ModifyListener; |
| import org.eclipse.swt.layout.RowLayout; |
| import org.eclipse.swt.widgets.Display; |
| import org.eclipse.swt.widgets.Shell; |
| import org.eclipse.swt.widgets.Text; |
| |
| /** |
| * Snippet -1. |
| * |
| * Hello, no databinding. Bind changes in a GUI to a Model object but don't |
| * worry about propogating changes from the Model to the GUI -- using *manual* |
| * code. (0xffffffff is -1 in 32-bit two's complement binary arithmatic) |
| */ |
| public class Snippet0xffffffff { |
| public static void main(String[] args) { |
| ViewModel viewModel = new ViewModel(); |
| Shell shell = new View(viewModel).createShell(); |
| |
| // The SWT event loop |
| Display display = Display.getCurrent(); |
| while (!shell.isDisposed()) { |
| if (!display.readAndDispatch()) { |
| display.sleep(); |
| } |
| } |
| |
| // Print the results |
| System.out.println("person.getName() = " |
| + viewModel.getPerson().getName()); |
| } |
| |
| // Minimal JavaBeans support |
| public static abstract class AbstractModelObject { |
| private PropertyChangeSupport propertyChangeSupport = new PropertyChangeSupport( |
| this); |
| |
| public void addPropertyChangeListener(PropertyChangeListener listener) { |
| propertyChangeSupport.addPropertyChangeListener(listener); |
| } |
| |
| public void addPropertyChangeListener(String propertyName, |
| PropertyChangeListener listener) { |
| propertyChangeSupport.addPropertyChangeListener(propertyName, |
| listener); |
| } |
| |
| public void removePropertyChangeListener(PropertyChangeListener listener) { |
| propertyChangeSupport.removePropertyChangeListener(listener); |
| } |
| |
| public void removePropertyChangeListener(String propertyName, |
| PropertyChangeListener listener) { |
| propertyChangeSupport.removePropertyChangeListener(propertyName, |
| listener); |
| } |
| |
| protected void firePropertyChange(String propertyName, Object oldValue, |
| Object newValue) { |
| propertyChangeSupport.firePropertyChange(propertyName, oldValue, |
| newValue); |
| } |
| } |
| |
| // The data model class. This is normally a persistent class of some sort. |
| // |
| // In this example, we only push changes from the GUI to the model, so we |
| // don't worry about implementing JavaBeans bound properties. If we need |
| // our GUI to automatically reflect changes in the Person object, the |
| // Person object would need to implement the JavaBeans property change |
| // listener methods. |
| static class Person extends AbstractModelObject { |
| // A property... |
| String name = "John Smith"; |
| |
| public String getName() { |
| return name; |
| } |
| |
| public void setName(String name) { |
| this.name = name; |
| } |
| |
| } |
| |
| // The View's model--the root of our Model graph for this particular GUI. |
| // |
| // Typically each View class has a corresponding ViewModel class. |
| // |
| // The ViewModel is responsible for getting the objects to edit from the |
| // data access tier. Since this snippet doesn't have any persistent objects |
| // to |
| // retrieve, this ViewModel just instantiates a model object to edit. |
| static class ViewModel { |
| // The model to bind |
| private Person person = new Person(); |
| |
| public Person getPerson() { |
| return person; |
| } |
| } |
| |
| // The GUI view |
| static class View { |
| private ViewModel viewModel; |
| |
| public View(ViewModel viewModel) { |
| this.viewModel = viewModel; |
| } |
| |
| public Shell createShell() { |
| // Build a UI |
| final Display display = Display.getCurrent(); |
| Shell shell = new Shell(display); |
| shell.setLayout(new RowLayout(SWT.VERTICAL)); |
| |
| final Text name = new Text(shell, SWT.BORDER); |
| |
| // Bind it (manually) |
| name.setText(viewModel.getPerson().getName()); |
| name.addModifyListener(new ModifyListener() { |
| public void modifyText(ModifyEvent e) { |
| final String text = name.getText(); |
| // validation |
| // conversion |
| viewModel.getPerson().setName(text); |
| } |
| }); |
| viewModel.person.addPropertyChangeListener("name", |
| new PropertyChangeListener() { |
| public void propertyChange(PropertyChangeEvent evt) { |
| display.asyncExec(new Runnable() { |
| public void run() { |
| final String newName = viewModel.person.getName(); |
| // conversion |
| name.setText(newName); |
| } |
| }); |
| } |
| }); |
| |
| // Open and return the Shell |
| shell.pack(); |
| shell.open(); |
| return shell; |
| } |
| } |
| |
| } |